How to manage apple trees in summer?

How to manage apple trees in summer? Please introduce the method of summer apple tree management can refer to the following methods: first, disease prevention and pest control. In summer, with high temperature and humidity, it is most easy for all kinds of bacteria and pests to breed and multiply. Therefore, it is particularly important to do a good job in the defense of diseases and insect pests. Its defense measures are: comprehensive drug control, manual prevention, targeted prevention. Second, prevent the loss of fat and lack of fertilizer. Summer is the peak of fertilizer demand for apple trees, if not topdressing in time, it will lose fertilizer and affect the tree potential and the normal development of young fruits. Therefore, fertilizer should be applied in time. Usually for general big trees, 50 kg of feces and urine or urea, calcium superphosphate and potassium sulfate can be applied to each hole and mixed into 2 kg at 3:10:5. For fields with significant de-fertilization, 2% urea aqueous solution can also be foliar sprayed when spraying. At the same time, apple trees with symptoms of element deficiency should be remedied by spraying fertilizer. For fruit trees with calcium deficiency and water heart disease, 0.5% calcium nitrate aqueous solution can be sprayed 2 ~ 4 times from the fruit expansion period to 10 or 8 weeks before harvest. Third, prevent sunburn. With high temperature and strong sunshine in midsummer, the local temperature of apple fruit is sometimes as high as 45 ℃ and sunburn occurs. The symptom is that black spots first appear on the fruit surface, and then gradually expand until rotten, which has a great impact on the yield. The defense methods are as follows: one is to water or spray the orchard at the right time to cool and humidify and prevent the direct harm of high temperature and strong light to the fruit; the other is to apply white, sticker or bagging to the fruit which is prone to sunburn. The formula of whitening agent is lime, water is 1.5-4, add a little salt, mix it into paste. Fourth, prevent premature senility. Summer is the peak period of nutrition consumption of apple trees, and premature senility often occurs because of lack of fertility or waterlogging disaster. Therefore, in summer, in addition to timely topdressing to prevent premature senility, we should also pay attention to waterlogging. Because waterlogging is the main cause of premature senescence of apple trees, it is necessary to clear ditches and drain water in time so that the rain passes the ground dry, the garden does not accumulate water, and the garden soil is dry. Click to get more apple tree planting techniques click to get more fruit planting techniques